:root{font-family:Inter,system-ui,sans-serif;color:#1f2937;background:#f7f7f8}body{margin:0}*{box-sizing:border-box}img{max-width:100%;display:block}.app-shell{max-width:1100px;margin:0 auto;padding:2rem}.hero{margin-bottom:1.5rem}.panel{background:#fff;border:1px solid #d1d5db;border-radius:12px;padding:1rem;margin-bottom:1rem}label{display:block;margin-bottom:1rem}label span{display:block;font-size:.9rem;margin-bottom:.35rem}input,button{font:inherit}input[type=number],input[type=file]{width:100%}button{background:#0f766e;color:#fff;border:none;border-radius:10px;padding:.7rem 1rem}button:disabled{opacity:.6}.results{display:grid;gap:1rem}.layer-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:1rem}.layer-card{background:#fff;border:1px solid #d1d5db;border-radius:12px;padding:.75rem}.error{color:#b91c1c}